The purpose for wing is down-force, don't know why he would need a supercharger to go with it. Your comment makes no sense.

On higher speed tracks like Willow Springs out here in SoCal, the downforce from the aero will prevent a naturally aspriated M3 from getting very far past 120mph. With the Gintani Stg 2 kit making 570 RWHP, Josh's car can power through the significant aero drag which keeps his car absolutely planted yet allows him to hit 130+ thorugh turn 8 and 140+ on the back straights. No way an NA M3 could do that. That's why str8flexin just did a 1:27 there. Aero+supercharger is the only way to achieve those times.